AGFA 307 Owner's Manual page 51

Self-Timer
The self-timer will delay release of the shutter for approximately ten
seconds after you press the shutter release button, giving you time to
get into the picture.
1. Press the self timer button. Self-timer indicator will appear on
the data panel. Pressing the self-timer button again will cancel
the self timer.
2. Compose the picture and press the shutter release button all the
way down to start the self timer.
The self-timer lamp on the front of the camera will blink until the
shutter releases.
Self-timer mode will automatically cancel after the exposure.
To cancel the self timer before the shutter releases, slide the main
switch to lock.